A statistics professor has noted from past experience that a student who study at least 5 hours per week has a probability of 0.8 of getting a grade of B or better, while a student who studies less than 5 hours a week has a probability of 0.2 of getting a B or better. It is known that 60% of the students study 5 hours or more per week. Find the probability that if a student who has earned a B or better grade, he/she studied at least 5 hours per week. (Write your answer in decimal form, to the nearest hundredth. That is, if the answer is .3456, write .35).